1. Szejtli, J. (1988),Cyclodextrin technology, Kluwer, Dordrecht, pp. 14 and 28–30.
2. Armbruster, F. C. and Kooi, E. R. (1969), US Patent 3,425, 910.
3. Vakaliu, H., Miskolczi-Török, M., Szejtli, J., Járai, M., and Seres, G. (1979), Hung. Patent16, 098.
4. Okada, S. and Tsujama, M. (1973), US Patent 3, 812, 011.
5. Sato, M. and Nakamura N. (1974), Japan Patent 7,492,288.